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Three-Dimensional Numerical Simulation of Controlled-Source Electromagnetic Method Based on Third-Type Boundary Condition
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Three-Dimensional Numerical Simulation of Controlled-Source Electromagnetic Method Based on Third-Type Boundary Condition
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Three-Dimensional Numerical Simulation of Controlled-Source Electromagnetic Method Based on Third-Type Boundary Condition
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Journal Article
Three-Dimensional Numerical Simulation of Controlled-Source Electromagnetic Method Based on Third-Type Boundary Condition
2025
Overview
Controlled-source electromagnetic method (CSEM), as a significant geophysical exploration technique, plays a crucial role in imaging subsurface structures. To enhance the accuracy and efficiency of CSEM simulations, this paper introduces a 3D unstructured vector finite element numerical simulation method based on the third-type boundary condition. Vector finite elements are particularly suitable for handling discontinuities in the electric field normal. They automatically satisfy tangential field continuity and zero-divergence requirements, providing a solid foundation for forward modeling in the CSEM. The adoption of the third-type boundary condition aims to reduce computational scale while ensuring higher simulation accuracy. Using this method, we conducted detailed numerical simulations on various models, including layered models, single-anomaly models, composite-anomaly models, and layered-anomaly models. The experimental results demonstrate that the algorithm accurately reproduces the electromagnetic responses of various geological models. It also exhibits superior computational accuracy under low-frequency conditions, outperforming traditional simulation methods. In summary, the 3D unstructured vector finite element numerical simulation method proposed in this study offers an efficient and reliable solution for CSEM, which is of great significance for advancing CSEM technology, especially in inversion techniques and data interpretation. Future work will focus on further optimizing algorithm performance and exploring its application potential in complex geological environments.
